Xilinx, Inc.

Pedro W Neto

Declan Carey

Ronan Sean Casey

Frantz Stephane Florent Ngankem Ngankem

Apparatus and associated methods relate to a time-interleaved integrating sampling front-end circuit using integrating buffers. In an illustrative example, a circuit may include N sampling layers of circuits, an isampling layer of circuits of the N sampling layers of circuits may include: (a) Xbuffers configured to receive an analog signal, X&#x2265;1, and, (b) Ytrack-and-hold circuits, each track-and-hold circuit of the Ytrack-and-hold circuits is coupled to an output of a corresponding buffer of the X buffers, Y&#x2265;1, at least one buffer of the Xbuffers may include an integrating buffer, N&#x2265;i&#x2265;1. By implementing integrating buffers, a faster linear type of step settling response may be obtained as opposed to a slower exponential type of settling response.

Low power device for high-speed time-interleaved sampling

Apparatus and associated methods relate to a logic circuit having a number of unit circuits performing buffering and data storage functionalities in parallel. In an illustrative example, a logic circuit may include N unit circuits for data storage and N&#x2212;1 unit circuits for buffering. During a conversion cycle, only an iunit circuit of the N unit circuits and an (i&#x2212;1)unit circuit of the N&#x2212;1 unit circuits may be enabled. Output status of the iunit circuit of the N unit circuits may be monitored to disable the iunit circuit, and also enable an (i&#x2212;1)unit circuit of the N unit circuits and an (i&#x2212;2)unit circuit of the N&#x2212;1 unit circuits. By performing buffering and data storage in parallel, propagation delays in the SAR logic circuit may advantageously be reduced, and thus, conversion time of a successive-approximation-register (SAR) analog-to-digital converter (ADC) may be advantageously reduced.

High-speed successive-approximation-register (SAR) analog-to-digital converter (ADC) control logic circuit

Apparatus and associated methods relate to providing a regulation loop using a digital representation of a loop error signal along with a flexible multiplying capacitive digital-to-analog converter (MC-DAC) circuit to control one or more power switches (e.g., transistors) delivering required power (including voltage and/or current) to a load circuit. In an illustrative example, the MC-DAC circuit may include a digital-to-analog converter (DAC) configured to selectively couple to two different reference voltages in response to switch control signals generated by a digital filter. A capacitive level shifter may be coupled to the output of the DAC. A re-sampling circuit may be coupled to the output of the capacitive level shifter to generate a gate control signal to control the one or more power switches. The regulation loop may advantageously generate the gate control signal using a substantially reduced die area.

Hybrid multiplying capacitive digital-to-analog converter (MC-DAC) based loop regulation

Apparatus and associated methods relate to unit circuits that having a number of capacitors and/or buffers controlled by two different control signals, capacitors and/or buffers that receiving, through routing, a same control signal from a control circuit are physically placed adjacent without crossing routings that connects capacitors and/or buffers controlled by a different control signal. In an illustrative example, a first capacitor may be configured to receive a first control signal through an inverting buffer, and a second capacitor may be configured to receive the first control signal through a non-inverting buffer, the inverting buffer and the non-inverting buffer may be provided by an integrated buffer structure. By arranging the physical positions of the capacitors and/or buffers, wire capacitances of the unit circuit may be advantageously reduced.

Device for high-speed digital-to-analog conversion

Apparatus and associated methods relate to a clock generation circuit which generates asynchronous clock signals for a successive approximation ADC architecture based on time-interleaved comparators. In an illustrative example, a circuit may include (a) a first comparator configured to receive an input signal and generate a first ready signal to indicate a comparison decision being complete, (b) a second comparator configured to receive the input signal and generate a second ready signal to indicate a comparison decision being complete, and (c) a clock generation circuit coupled to receive the first and the second ready signals and generate a first clock for the first comparator and a second clock for the second comparator. The first and the second clock signals may be in anti-phase. Thus, each comparator may have enough time to reach a valid comparison in each successive approximation cycle, and kickback noises at comparator' inputs may be advantageously reduced.

Low power and high-speed circuit for generating asynchronous clock signals

A circuit for asynchronous clock generation is described. The circuit comprises a first comparator configured to receive an analog input signal; a second comparator configured to receive the analog input signal; and a clocking circuit coupled to the first comparator and the second comparator; wherein the clocking circuit generates a first asynchronous clock signal for the first comparator and a second asynchronous clock signal for the second comparator. A method of providing asynchronous clock generation is also described.

Circuit for and method of implementing asynchronous clock generation

Apparatuses and method relating to DFE include a decision feedback equalizer with first and second integrating summers configured to receive an input differential signal. A bias current circuit is configured to alternate biasing of the first and second integrating summers. The first and second integrating summers alternately integrate, during clock signal phases of a clock signal and its complement, for transconductance of the input differential signal to a first output differential signal and a second output differential signal, respectively. The first and second integrating summers alternately drive, during other clock signal phases of the clock signal and its complement, residual voltages of the first output differential signal and the second output differential signal, respectively, to a same voltage level. A first clock signal and a second clock signal are out of phase with respect to one another for interleaving the first output differential signal and the second output differential signal.

Growing community of inventors

Douglas, Ireland

Pedro W Neto